Window-lock



- S. KRAFKA.

WINDOW LOCK.

APPLICATIONjFILED FEB. 12, 1919.

Patented Feb. 3, 1920.

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Specification- Letters Patent. Patented 3, I

Application filed amt- 12, 1919. Serial'No. 276,548.

To all whom it mag concern:

Be it knowiithat I, STEFAN Knarim, a

citizen of Austria, residing at Chicago inthe county of Cook 'a1id State of Illinois, have invented certain new and useful lm provements in Hiidou Locks, of which the following is a specification.

This invention relates to in'iprov'ements in looks of that type which is especially-designed for locking the sash of a window although the invention is not necessarily limited to such use and may be utilized with equal effectiveness for various other purposes. e

The invention has for its primary object to provide a lock equipped with a spring retracted bolt which is locked in projected position by a key controlled plunger, the arrangement of the key and bolt being such that the key' is utilized to project the bolt to upward positions.

.lVith the above and other objects-in view as will appear as the description proceeds, the invention comprises-the novel features of construction, combination and arrangement of parts which will be more fully described in the followin specification and set forth with particularity in the claims appended hereto.

In the drawings r Figure 1 represents a fragmentary elevation of a conventional type of window ilhistrating' the invention applied thereto,

Fig. 2 represents a horizontal sectional view, partly broken away, of the window showing the interior construction of the lock,

Fig. 3 represents a vertical sectional view taken at right angles to Fig. 2,

- Fig. 4 represents a rear or bottom plan view of the lock casing,

Fig. 5 represents a perspective view of the key detached, and

Fig. 6 represents a fragmentary elevation of a window illustrating a modified type of locking plate applied to the window frame structure.

Referring to the drawings in detail, wherein similar reference numerals designate corresponding parts throughout the several views, the numeral 7 indicates the casing of the lock which may be constructed of sheet metal struck up medially to provide the casing portion and having terminal apertures 8 in the extended flanged portions 9 affording adequate means for receiving screws or other'fasteners by which the casing is fastened in position upon a windowfran'ie or other support. The end walls 10 and'll of the casing are formed by inturned portions ofthe sheet metal from which the same is constructed and thebolt 12 is mounted for longitudinal movement in the casing and is provided with a reduced'terminal 13 1 adapted to be projected through the open ing 14 formed in the front end wall 10.

The bolt is normally retained in retracted position by the tension of the coil spring 15 confined between the end wall 10 and a shoulder 16 of the bolt and serving also to maintain the rear plate 17 of the lock casing in operativeposition during operation of the lock. The extremities of the plate 17 are di rected angular-1y as indicated at 18 and 19 and the extension 18 is confined between one end of the bolt 12 and the corresponding end 11 of the casing whereas the opposite angular a terminal 1 9 of the plate is confined between the spring 16 and end walls 10 and thus frictionally held in operative position. The front wall of the casing- 17 is formed with a longitudinal slot 20 through which a key hole 21 in the bolt 12 is at all times visible regardless of. the position of the .bolt and a key 22 is adapted for insertion in the hole to facilitateretraction and projection of the bolt.

A plunger 23 is reciprocably mounted in a transverse opening 24 formed in the bolt and is normally retained in outwardly extending position by the tension of a coil spring 25 hearing at one terminal upon the inner surface of one of the side walls of the casing 7 and engaged at its opposite terminal with the enlarged extremity 26 of the plunger. The outer terminal of the plunger is rounded and adapted for reception in a depression or recess 27 formed internally of the casing and so arranged as to receive the plunger when the bolt is extended as illustrated in Fig. 2. The enlarged terminal of the opening receiving the plunger 24 intersects the transverse key receiving opening 21 and communicates therewith and thus when 7 the plunger is in outwardly extended or operative position as illustrated in Fig.2 the circular head 26 projects into the opening 21 and is received within. the longitudinal defined by the slot in the key abuts the head permitting withdrawal of the bolt 12.

The reduced terminal of the bolt 12 is de with a plurality of variously spaced apertures 30 of such size asto accommodate the bolt and the lock and plate may be applied, respectively, to the upper and lower window sashes 31 and-'32 so that the latter maybe eflectively locked and closed or various other positions, as desired, The bolt 12 is normally retained in retracted or inoperatim position by the tension of the spring 15 andwhen it is desired to lock the window sashes, the bolt is projected with the assistance of the key 22 which is inserted in the opening 21 moving the bolt against the tension of the spring 15 and engaging the reduced forward terminal thereof in one of the apertures 30 of the locking plate 29. As the bolt approaches the limit of its projection the plunger 23 is automatically seated in the depression 27 b the influence of the spring 25 thereby e ec'tively locking'the bolt. in projected position. To release the bolt, the key isinserted in the opening 21 and partially turned so as to engage one of the rad al:

shoulders defined by the groove 28 with the terminal 26 01? the plunger thereby with drawing the latter from the depression 27 and permitting the. bolt to move inwardly under the influence of the spring 15.

In the modification of the invention illustrated in Fig. 6, the plate 29 is of slightly greater width than the type of plate illustrated in Fig 1 and it is designed to be secured along one longitudinal edge to one of the side membersof the upper sash instead of to the center member of the sash as shown in- Fig. 1.

What I claim is 1. A lock including a casing, a bolt reciprocably mounted in said casing provided vs1gned to cooperate with a'plate 29 provided with intersecting and communicating openngs, a spring actuated plunger mounted in one of said openings for locking the bolt in projected position, a cylindrical head carried by said plunger, and a key removably engaged in the other opening having a longitudinal groove defining a radial shoulder 'forengaging and moving the head inwardly to retract the plunger during rotary .movement of the keyv in one direction.

2. A lock including a casing having an open back and a slotted front wall, a bolt reciprocably mounted in said casing having a reduced terminal adapted for projection through one end of the casing,'spring means i confined between. said end of the casing and the adjacent terminal of thebolt to maintain the latter in retracted position, said bolt having intersecting transverse-openings, a spring actuated plunger movable in one of the openings and enga-geable with the cas ing to maintain the bolt in projected position, a cylindrical head carried by the inner terminal of the plunger, and a longitudinally slotted key provided with a radial shoulder adapted for insertion in the other opening, the radial shoulder 0t said key being engageable with the head to withdraw the plunger incident to rotary movement of the key, said key constituting a handle for adjusting the bolt and being slidably received in the slot in the casing.

In testimony whereof I afliX ny signature hereto.

STEFAN KRAFKA. 

